Investigation of Fano resonance in compound resonant waveguide gratings for optical sensing  

作　　者：胡劲华 刘秀红 赵继军 邹俊 

机构地区：[1]The School of Information & Electrical Engineering, Hebei University of Engineering, Handan 056038, China [2]The School of Mathematics & Physics, Hebei University of Engineering, Handan 056038, China [3]College of Science, Zhejiang University of Technology, Hangzhou 310023, China

出　　处：《Chinese Optics Letters》2017年第3期60-63,共4页中国光学快报（英文版）

基　　金：supported by the Scientific Research Projects of the Department of Education of Hebei Province(Nos.QN2014134 and QN2016090);the Natural Science Foundation of Hebei Province(No.A2015402035);the National Natural Science Foundation of China(NSFC)(No.61605172)

摘　　要：An optical sensor is designed to support the Fano effect based on a compound resonant waveguide grating （CRWG）. The transmission spectra of the CRWG are investigated by utilizing a theoretical method that combines the temporal coupled mode theory with the eigenmode information of the grating structure. The theoretical results, which are observed to agree closely with those acquired by rigorous coupled-wave analysis, show that the linewidth of the transmission spectrum decreases upon increasing the distance between the grating strips, and the central resonance frequency decreases as the refractive index of the analyte increases. Here, the proposed CRWG structures will find potential uses in optical sensing.An optical sensor is designed to support the Fano effect based on a compound resonant waveguide grating （CRWG）. The transmission spectra of the CRWG are investigated by utilizing a theoretical method that combines the temporal coupled mode theory with the eigenmode information of the grating structure. The theoretical results, which are observed to agree closely with those acquired by rigorous coupled-wave analysis, show that the linewidth of the transmission spectrum decreases upon increasing the distance between the grating strips, and the central resonance frequency decreases as the refractive index of the analyte increases. Here, the proposed CRWG structures will find potential uses in optical sensing.

关 键 词：Optical waveguides Refractive index RESONANCE 

分 类 号：TN25[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]